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30 def __init__(self, df: DataFrame, columns: List[str]) -> None: 31 self._df = df 32 self._group_labels, self._group_position = self._create_groups(columns) 33 self._group_columns = columns 34 35 if len(self._group_position) == self._df.shape[0]: 36 warnings.warn("Each group contains exactly one row of data. " 37 "Are you sure you are grouping correctly?")